A Study on the Effect of Non-Idealized Crack on a 90° Elbow by Using Finite Element Analysis

Volume 6B: Materials and Fabrication Pub Date : 2018-07-15 DOI:10.1115/PVP2018-84758

Jae-Hee Kim, Min Kyu Kim, Ye-Rin Choi, D. Cho, Moon-Ki Kim, Jaeboong Choi

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引用次数: 1

Abstract

The present paper proposed the modified limit load solution related to code case N-513-4 which is currently actively researched. To apply to assessment method for an elbow in code case N-513-4, the crack should be postulated as the idealized circumferential through-wall crack (TWC). For this reason, it could be led to overestimate the results due to the assumption of real crack shape. Then, the many research which is related to an accurate solution for a straight pipe by considering realistic crack has been investigated. However, the accurate solution for the elbow with non-idealized TWC is still lacked. Therefore, based on three-dimensional finite element model, the effect of non-idealized circumferential TWC on plastic limit load was investigated under internal pressure. To do this, the finite element (FE) model and analysis procedure employed in the present numerical study were validated by comparing the present finite element analyses result with existing solutions for idealized TWC in the elbow. Then, the correction factor for calculating plastic limit load was newly proposed as a tabulated form by considering practical ranges of geometry.

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非理想裂纹对90°弯头影响的有限元分析

本文针对目前正在积极研究的N-513-4规范案例，提出了改进的极限荷载解。为适用于规范案例N-513-4中弯头的评定方法，应将弯头裂纹假定为理想的周向穿壁裂纹。因此，由于假设裂纹的真实形状，可能导致对结果的高估。然后，对考虑实际裂纹的直管的精确解进行了研究。然而，对于非理想TWC的肘关节，目前仍缺乏准确的解决方案。因此，基于三维有限元模型，研究了内压作用下非理想周向TWC对塑性极限载荷的影响。为此，通过将有限元分析结果与已有的理想弯头TWC解进行比较，验证了本文数值研究中采用的有限元模型和分析方法。在此基础上，考虑实际几何范围，提出了计算塑性极限载荷的修正系数的表格形式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 6B: Materials and Fabrication

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